Climate Insights for Twin Falls

The climate in Twin Falls is temperate. The average annual temperature is 11°C and approximately 336mm of precipitation falls per year. December is the wettest month, receiving around 46mm of rainfall. Twin Falls is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to -4°C. Snowfall occurs from January to December, with around 89cm accumulating over the season.

Twin Falls has a wide annual temperature range, spanning 39°C from the coldest to warmest months. July is the hottest month, with daytime highs reaching 35°C and an average of 26°C. The coldest month is January, when overnight lows fall to -4°C and the daily average is -1°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 8°C shift in average temperatures.

Twin Falls is a quite dry location, receiving approximately 336mm of precipitation annually, which averages out to around 28mm per month. The wettest month is December, averaging 46mm of rainfall. March and January also tend to see above-average precipitation. The driest month is July, with just 4mm. That's 42mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 89cm accumulating over the season. January typically sees the most snow at around 23cm.

Twin Falls is relatively calm, with an average annual wind speed of 11km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.

It is currently summer in Twin Falls, which began on June 21, 2026. Twin Falls is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 35°C, while the coldest stretch bottoms out in January near -4°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Twin Falls is during May, June, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 20mm per month. By contrast, July can be uncomfortably hot with highs reaching 35°C, while January is the coldest period with lows dropping to -4°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Twin Falls based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.